Saw lubricating device



July 25, 1944. J. E. JOHNSON 4 sAw LUBRIGATING DEVICE Filed. Oct. 9 1942 2 sheets-sheet 1 Inventor JaeZ Ezra/.75 msvw July 25, 1944.

J. E. JOHNSON SAW LUBRICATING DEVICE Filed Oct. 9, 1942 2 Sheets-Sheet 2 Inventor Patented July 25, 1944 v UNITED -S;TATES PATENT OFFICE f sAW1.1mmcls'r1no nEvicE ,7 I Joel E z raJohnsonlBoaz, Ala; I A Application October 9, 1942, Serial No. 461,459

1 v icmi 1. 1451. j3 j My invention relates to improvements in saw lubricating devices, for hand saw blades, the principal object in view being to provide an'i'nexpensive, simply constructed, easily operative device of the character indicated and which may be manufactured for the trade as a handle forming unit adapted for easy attachment to dife ferent saw bladesas desired.

Other and subordinate objects are also comprehended by my invention, all of which, together with the precise nature of my improvements, will be readily understood when the succeeding description and claim are read with reference to the drawings accompanying and forming part of this specification.

In said drawings:

Figure -1 is a view in side elevation of a saw blade equipped with my improved lubricating de' vice in its preferred embodiment,

Figure 2 is a fragmentary view in top plan,

Figure 3 is a similar view in bottom plan,

Figure 4 is a view in longitudinal vertical section taken on the line 4-4 of Figure 2 and drawn to an enlarged scale,

Figure 5 is a fragmentary view in vertical section illustrating the pump cylinder, piston, and intake and outlet valves,

Figure 6 is a fragmentary view in plan of the oil ejecting line, and

Figure 7 is a view in perspective of the trigger.

Referring to the drawings by numerals, according to my invention a saw handle I, of substantially the usual design, is provided and which embodies the usual vertically slit front portion 2 adapted to fit over the rear end of the saw blade 3 and in which said blade 3 is secured by means of the usual screws 4. The handle I is provided with the usual elongated opening 5 for accommodating the finger and is hollow to thereby form an oil containing receptacle. An upper rear nipple 6 is formed on said handle for introducing oil into said handle and which is adapted to be closed by means of a screw plug 1. The plug 1 is of knurled construction at its outer end to facilitate gripping the same and the nipple 6 is provided with a filtering screen 8 therein. The top of the handle I is provided with an access opening 9 therein for insertion of the presently described parts in the handle. A cover plate 10 is provided for the opening 9 to be secured to the handle I by means of screws ll.

Within the rear portion of the handle I is an upright pump cylinder 12 having its closed bottom end secured, as by a screw l3, to the bottom of the handle. A pair of intake and outlet ball-type valves l2, l2" extend from opposite sides of the cylinder [2 adjacent the bottom of the sar'ne, the intake valve being of the inwardly opening type and the outlet valve opening outwardly; A'piston type plunger [4 is fitted in the pump cylinderli. A plunger operating rod l5 extends from said plunger upwardly out of the upper end of the cylinder through'a fixed guide i6=in said handle I.

Operating'means for the plunger rod l 5 is provided as follows: At'the upper end of the openin'g-5 and mounted in the wall I! forming said opening, by means of a ball and socket joint l8,

is a trigger ls'having a lower finger grip Hidepending into said opening 5 and an upper right angled end 2| projecting into the upper part of the handlel and equipped with an upstanding yoke'23; -A suitably arranged stop 24 bearing against the upper end 2| of said trigger l9 limits rearward movement of said upper end 2|. A coil. spring 25 suitably connected at one end to the yoke 23 and having its opposite end connected to a fixed pin 23, in the handle I, in the rear of the yoke 23, urges said upper end 2i of the trigger I9 rearwardly against the stop 26.

A bell crank 21 is pivoted in the handle I in the rear of the trigger I9 for vertical rocking movement about a transverse stud 28 and which includes an upstanding front arm 29 and a rearwardly extending lower arm 30, the latter operatively connected to the plunger rod 15 by means of aslot 3| in the arm and a pin 32 traversing said rod. The arm 30 of the bell crank 21 is adapted to be intercepted by the aforementioned guide It to limit downward movement of the plunger operating rod l5 and the plunger l4 and thereby establish the normal position of said rod and plunger. A helical expansion spring 33 is interposed between the bell crank arm 38 and the plate It] with one end sleeved over a stud 34 on the plate l0 and its other end sleeved over the upper end of said rod l5 and bearing downwardly on the bell crank arm 30. As will be clear, the spring 33 urges the bell crank arm 30, and consequently the plunger operating rod and plunger i4 downwardly. A bell crank operating rod 35 is pivoted at its rear end, as at 33, to the upper end of the bell crank arm 29 for vertical swinging movement and extends forwardly through the yoke 23 over the upper end 22 of the trigger IS. The upper end of said trigger I9 is formed with an arcuate convex upper camming edge 31 adapted, in the normal position of the part to seat in a lower edge notch 38 provided in the rod 35 and whereby said upper end 22 of said trigger is interlocked with said rod in the normal position of the parts. A coil spring 39 suitably connected to the rod 34 and to the bell crank 21 yieldingly tensions the rod 35 against upward swinging.

An oil discharge line 40 extends upwardly from the discharge valve I2 to the upper front portion of the handle I, within the same, and is connected by an upper end fitting 4| to an inverted U- shaped branch line 42 depending in the front portion of the handle I and terminating in a pair of forwardly extending spray nozzles 43 projecting from the front edge of the handle I alongside opposite sides of the saw blade 3 and inclining forwardly and downwardly as best shown in Figure 4 to spray substantially the rear half of said blade below the longitudinal center thereof.

Referring now to the operation, the handle I being filled with oil, the lower end of the trigger I9 is pulled rearwardly by the finger, thus rocking the upper end 2| of said trigger forwardly. The upper end 2| of the trigger l9 first moves the rod 35 forwardly in opposition to the spring and at, the same time the cam edge 31 cams said rod upwardly and releases the same. Upon release of the rod 35 the spring "25 moves the same rearwardly. The spring tensions the rod against upward movement. Forward movement of the rod 35 rocks the bell crank =21 counter-clockwise as viewed in Figure 4. During such movement of the bell crank '21, the arm 35! thereof pulls the plunger operating rod [5 and plunger upwardly to draw oil into the 'bottom of the cylinder ['2 by way of the intake valve [2. As soon as the rod 35 is released, the spring 33 returns the bell crank 21 and the plunger op erating rod l5 and plunger 14, together with the rod 35, to starting position. During return of the plunger M the oil in the cylinder I2 is forced out of the same by way of the discharge valve I2", oil discharge line 40, branch lines 42 and nozzles 43 to be ejected from the latter against the sides of the saw blade 3.

The foregoing'will, it is believed, sufiice to impart a clear understanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible of modification without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the subjoinedclaim.

What I claim is:

In a blade lubricating device for a saw of the type having a hollow oil-containing handle provided with a finger accommodating opening therein, a fluid pump adapted to be mounted in said handle and having intake and discharge sides, respectively, and a plunger operative in one direction to draw oil in the said intake side and in the opposite direction to force oil out of said discharge side, an oil discharge line extending from said discharge side and including jets adapted to discharge 'againstoppositevsides of the blade, spring means adapted for mounting in said handle :and for operating said plunger in said opposite direction, means for operating said plunger in said one-direction in opposition to said spring means adapted to be mounted in said handle and comprising a trigger adapted to be arranged in saidopening, and operating connections between said trigger and plunger, automatically disconnected under operation of said trigger beyond a predetermined point, said operating connections comprising a cam end on said trigger, and a pivoted lever having an edge notch therein with which said cam edge normally engages, said cam under movement of said trigger beyond said predetermined point disengaging said notch.

, JQEL EZRA JOHNSON. 

